edu.purdue.cs.HSPGiST.HadoopClasses.LocalHSPGiSTOutputFormat.java Source code

Introduction

Here is the source code for edu.purdue.cs.HSPGiST.HadoopClasses.LocalHSPGiSTOutputFormat.java

Source

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package edu.purdue.cs.HSPGiST.HadoopClasses;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.mapreduce.RecordWriter;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import org.apache.hadoop.mapreduce.lib.output.SequenceFileOutputFormat;

import edu.purdue.cs.HSPGiST.HadoopClasses.NullableSequenceFile.Writer;

/**
 * Partial implementation of an OutputFormat based on SequenceFileOutputFormat to
 * allow for null values to be "written" to output as 0 bytes
 * @author Stefan Brinton
 *
 * @param <K>
 * @param <V>
 */
public class LocalHSPGiSTOutputFormat<K, V> extends SequenceFileOutputFormat<K, V> {

    protected edu.purdue.cs.HSPGiST.HadoopClasses.NullableSequenceFile.Writer getWriter(TaskAttemptContext context,
            Class<?> keyClass, Class<?> valueClass) throws IOException {
        Configuration conf = context.getConfiguration();

        Path file = getDefaultWorkFile(context, "");
        return edu.purdue.cs.HSPGiST.HadoopClasses.NullableSequenceFile.createWriter(conf, file, keyClass,
                valueClass);
    }

    public RecordWriter<K, V> getRecordWriter(TaskAttemptContext context) throws IOException, InterruptedException {
        final Writer out = getWriter(context, context.getOutputKeyClass(), context.getOutputValueClass());

        return new RecordWriter<K, V>() {

            public void write(K key, V value) throws IOException {
                out.append(key, value);
            }

            public void close(TaskAttemptContext context) throws IOException {
                out.close();
            }
        };
    }
}